LM4930 Datasheet | National Semiconductor

LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers July 2003 LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers General Description The LM4930 is an integrated audio subsystem that supports voice and digital audio functions. The LM4930 includes a high quality I2S input stereo DAC, a voice band codec, a stereo headphone amplifier and a high-power mono speaker amplifier. It is primarily designed for demanding applications in mobile phones and other portable devices. The LM4930 Features an I2S serial interface for full range audio, a 16-bit PCM bi-directional serial interface for the voice band codec and an two-wire interface for control. The full range music path Features an SNR of 86d B with a 16-bit 48k Hz input. The stereo DAC can also be used while the voice codec is in use. The headphone amplifier delivers 25m WRMS to a 32Ω single-ended stereo load with less than 0.5% distortion (THD+N) when AVDD = 3V. The mono speaker amplifier delivers up to 300m W into an 8Ω load with less than 2% distortion when AVDD = 3V. The LM4930 employs advanced techniques to reduce power consumption, to reduce controller overhead and to eliminate click and pop. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. It is, therefore, ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. Key Specifications j PH/P j PLS OUT at AVDD = 3.0V, 32Ω 25m W (typ) 300m W (typ) 2.6V to 4.5V 2.6V to 5.5V 2µA (typ) 50d B (typ) 0.5% THD+N OUT at AVDD = 3.0V, 8Ω 2% THD+N j Supply voltage range DVDD (Note 8) AVDD (Note 8) j Total shutdown current j PSRR at 217Hz, AVDD = 3V Features 16-bit resolution 48k Hz stereo DAC 16-bit resolution 8k Hz voice codec I2S digital audio data serial interface Two-wire serial control interface PCM voice audio data serial interface 25m W/channel stereo headphone amplifier 300m W...